Build failed. https://zuul.opendev.org/t/openstack/buildset/0773b71226cc4e47a1bf1d53d81efca4 - openstack-tox-docs https://zuul.opendev.org/t/openstack/build/855a2547a765444da460428dc3f3131e : SUCCESS in 4m 42s - openstack-tox-py27 https://zuul.opendev.org/t/openstack/build/72d9430299f1491e9d5d1a3da8eb8f3f : SUCCESS in 4m 14s - openstack-tox-py36 https://zuul.opendev.org/t/openstack/build/c799fb16301849a387038347a653a929 : SUCCESS in 2m 46s - openstack-tox-py37 https://zuul.opendev.org/t/openstack/build/1b6c62e2c4644c3386e24c466b16e327 : FAILURE in 2m 46s